Open Port Check Tool Help

To Test If Your Port Is Open

  1. Type in the port that you want to check.
  2. Choose TCP or UDP
  3. Click the Check Me button

About Software Firewalls

Software firewalls usually create seperate rules for different applications. You will need to allow your firewall to create a rule for PFPortChecker.exe when it tries to open up your port to be tested. If you do not Allow PFPortChecker.exe to open the port in your software firewall, then it will report that your port is closed EVEN IF YOU OPENED IT CORRECTLY IN YOUR ROUTER.

About How Bad Software Firewalls Are

We help 100's of people forward their ports every day, and there is one common problem that we run in to EACH AND EVERY DAY. That is the fact that many software firewalls simply do not work as advertised. We have seen the following bad or buggy behavior multiple times over:

What you should know is that if you have a software firewall on your computer and you are trying to setup port forwarding, it may be that your software firewall is going to cause you a lot of grief.

Why Our Open Port Check Tool Is Better

Most online port checks assume that you already have an application (such as your game or torrent) listening for the port test on your computer, and then assume that the test was OK simply because they were able to connect to your computer.

Also, web only port checkers are not able to test UDP since UDP is a connectionless protocol and there is no way to know if the packet actually made it to your computer without some sort of program on your computer waiting for that packet.

Our port test uses a local application to listen for the server trying to connect and then positively verifies that your port is forwarded.

In other words, with our open port check tool you never get a false positive!


After downloading PFPortChecker, you run the installation file to install it on your computer.

Then you run PFPortCheck (located in the Start menu under and type in the port you want to check, and whether you want to check TCP or UDP, and click Check Me.

If it says Your port is OPEN then we are absolutely sure that your port is definitely open. No other port checker can claim that.

If it says Your port is NOT OPEN or not reachable! then we were unable to establish a connection to your computer, which means that most likely either your port is not open or your software firewall is still preventing an inbound connection from being made.